[en] We report on magneto-optical imaging and the temperature dependency of the upper critical fields Hcc2(T) parallel to the c axis and Habc2(T) parallel to the ab plane in Ba2Ti2Fe2As4O single crystals. These data were inferred from the measurements of the temperature-dependent resistance in static magnetic fields up to 14 T and magnetoresistance in pulsed fields up to 60 T. Hc2 values are found to be 52 and 50 T for H∥ab and H∥c, respectively. These values are 1.2–1.35 times larger than the weak-coupling Pauli paramagnetic limit (Hp∼1.84Tc), indicating that enhanced paramagnetic limiting is essential and this superconductor is unconventional. Our observations of strong bending in the Habc2(T) curves and a nearly isotropic maximum upper critical field Habc2(0)≈Hcc2(0) support the presence of a strong Pauli paramagnetic effect. We show that the Werthamer-Helfand-Hohenberg (WHH) formula that includes the spin-orbit scattering can effectively describe the Habc2(T) curve, whereas Hc2 deviates from the conventional WHH theoretical model without considering the spin paramagnetic effect for the H∥c and H∥ab directions. For H∥c, a two-band model is required to fully reproduce the behavior of Hc2, while for H∥ab the spin paramagnetic effect is responsible for the behavior of Hc2. The anisotropy of Hc2 is close to 3 near Tc and decreases rapidly at lower temperatures.
Disciplines :
Physics
Author, co-author :
Abdel-Hafiez, M.
Brisbois, Jérémy ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Zhu, Z.
Hassen, A.
Vasiliev, A. N.
Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Krellner, C.
Language :
English
Title :
Upper critical fields in Ba2Ti2Fe2As4O single crystals: Evidence for dominant Pauli paramagnetic effect
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